A man was pronounced dead Monday night after being pulled from a pickup truck that plunged into the Nicasio Reservoir, authorities said.

The incident was reported about 6 p.m. off Point Reyes-Petaluma Road near Nicasio Valley Road. A witness told the California Highway Patrol that the truck was weaving in the road shortly before it crashed through a guardrail and went into the reservoir, said CHP Officer Eric Hohmeister.

The vehicle’s lights could be seen about 15 feet under the water surface, according to emergency broadcasts. Marin sheriff’s deputies, county firefighters and the California Highway Patrol responded to the reservoir, and rescuers went into the water.

A man about 65 to 70 years old was pulled from the water and brought to shore, where resuscitation efforts failed. The victim was pronounced dead at about 6:30 p.m., said county fire Battalion Chief Mike Giannini.

Divers were searched the reservoir Monday night to make sure no one else was in the water.

Authorities were working to confirm the identity of the dead man. At least one family member was on the scene.

The CHP closed Point Reyes-Petaluma Road in the area while rescue efforts were under way.

The crash is under investigation.

The incident occurred near the area of a double-fatality in 1994, when an Inverness couple was found dead in a pickup truck at the bottom of the reservoir. Amelio Giambastiani, 79, and his wife Frances, 73, were reported missing after going out for a shopping trip to San Anselmo, and it was a week until investigators discovered that they had crashed into the reservoir.

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